Method of and apparatus for removing threaded members



H. G. MARZYCK.

METHOD OF AND APPARATUS FOR REMOVING THREADED MEMBERS. APPIIICATHJN FILED JULY 29.1920.

1,380,07 1 Patented May 31, 1921,

' Um'rso srArss PATENT" emce- HEBMAH- G. HABZYCK, O1 JACKSONVILLE, FLORIDA.

miss on or sun To all whom z't-ma concern:

Be it known that HERMAN G. MAnzrcx,

a citizen of the United States, residing'nt 505 Main street, Jacksonville, in the county of Duval and State of Florida, have inve ted a new and useful Im rovement in Methods of and Apparatus or Removing Threaded Members, of which the following is n specification. i

This invention relates to the method of and apparatus for removingthreaded members, and more particularly to the method of and nppnrutusfor removing the broken end of a threaded pin that is left in a hole where access to both ends of the piece may be had. 7 A

It frequently. happens that a pin, bolt or other part which is held in place by having its end threaded into a hole, breaks ofileaving the threaded end in the hole. efore it new part can broken end must be removed from the hole. This'is fret uently very difficult owing to the fact that tie piece originally was screwed in ti htly and after being broken off does not cave enough projecting to furnish a or tool.

' Is a vertical sectional view of the device ing used to removethe broken and of a pin w are such and has a slot or nick adapted to receive a screw driver, blade.

As shown in said drawings, 7 indicates any part of any kind of device, for example,

the end of a bicycle or motor-cycle crank. The end of 7 is provided with a threaded hole 8 extending entirely therethrough for the purpose of retaining the threaded end of a bolt or pin such as a pedal pin. 9 indicates the threaded end of such bolt pin or other partJvhich has been broken oil in the hole 8.

My im roved device comprises a screw clamp 10 aving one of its jaws or arms 11 provided with a. threaded hole' 12 adapted to accommodate the screw 13 which hns its inner end pointed as indicated by 14, and its Specification or Letters Patent.

'AppBcatlon flied July 29,'

similar tool. The other is: or

' square hole 21 in' be put in place the vice in place on a" Arrmarus FOB movmo'rnnzansia nnmsnns.

Patented May 31, 1921.

1020. sci-lei no. 399,950. 0 outer end squared as indicated by 15 in order to permit tnrning by means of a clampindicated by 20 is provided with a which is ada squared end 22 of a bit 23. he bit 23 has its other end serrated, or notched to form the radial edges 24.

In the use of the device, the clamp is put in the position shown in Fig. 1, with the bit 23 in place in the clamp und'its serrated end against one end of the broken part. 9. The screw 13 is then screwed in -until the pointed end 14 comes into contact with the other end oLthe broken art 9. The screw 13 is then tightened until the teeth 24 bite into and engage firmly in the end of the broken part 9. When the clam been firmly fixed in place, the c amp itself is rotated. This will eauserotation of the bit 23, and consequent rotation of the part 9. In most instances a sligiliit rotation of the part 9 will loosen it so ciently so that it can be removed by hand. If it does not be come sniiicicntly loosened, however, by this slight rotation, it is obvious that the clamp can be loosened, turned back a distance; again put in place, and again mud: In this way, if necessary, used until the part 9 is. entirely out of. the hole, or projecting suflicicntly to afl'ord engafement by a pipe wrench or similar tool. 11 some instances the part broken off in the hole is provided at one end with a slot or nick adapted to receive the blade of a screw driver. In Fig. 6 Ihave shown such a part as indicated by 9 provided with the slot 31. Where such a slot is offered I H vide a bit 32 for use with the clamp. 0 bit 32 has a squared end 33 similar to the squared end 22 of the hit 23. Its other end has a. screw driver blade 34 adapted to engage with the slot 31. In Fig. 5 the clamp is shown in place with the bit 32 having its blade inengagement with the slot. The device is used in the same way as ex lained before, except that it does not use to be fastened so' tight since the blade 34 engaging with the slot in the part 30 will cause rotation and loosening of the pert when the clam is rotated.

at I claim as new and desire to secure by Letters Ifatent is: 1. In combination with a clamp having alined openings for bits, a threaded bit working injo'no of said openings, and a bit wrench or arm of the,

to may the clamp can be? v with respect to said a clamp having one of non-rotatably fitting the other of said 0 ings to cooperate with said threaded bit to clamp a part between the bits said threaded bit having its inner end pomteikafnd the other bit being provided with a ace to prevent rotation of the partblamped with respect to said bit.

2. In a device of,the character set forth a clamp having one of its jaws provided with a threaded hole, a screw extending through the threaded hole and having its inner end pointed, and a bit non-rotatably mounted in the other jaw of the. clamp, said bit lying in alinement with the screw and provided with a surface to prevent rotation bit of a part clamped the screw.

character setforth, its jaws provided with a threaded hole, a screw extending through the threaded hole and having'its inner end pointed, and a bit non-rotatably mounted in the other jaw of the clamp, said between said bit and 3. In a device of the a clamp having bit lying in alinement with and exten inwardl toward the point of the screw an provide with a surface to prevent rotation with respect to said bit of a part clamped between the bit and the pointed inner end of the screw. f

4. In a device of the character set forth one of its jaws provided with a threaded hole, a screw extending through' the threaded hole, and a bit nonrotatably mounted in the other jaw of the clamp, 'said bit and screw lying in alinement with each other and adapted to cooperate to clam a part between them, the bit being provi ed with a surface to prevent rotation of the part clam ed with respect to said bit, and the screw l ieing so constructed as to permit rotation thereof with res ect to the part clamped;

n testimony whereof I have hereunto set my hand, this 24 day oi July 1920.

HERMAN G. MARZYCK. 

